Stroke kit help and opinions
The max you can safely hone/bore a LS1/LS6 block is .010" over stock, so anything more than 3.908" is too much. Honestly, 3.903" or 3.905" is really all I would go on a performance motor regardless of stroke.
TECH Fanatic
Joined: Jun 2011
Posts: 1,343
Likes: 8
From: Katy, TX
Its the rod bolts clashing with the lower edge of the cylinder wall that causes the problem. With my 4" stroke, there was about 0.060" clearance without removing any material.
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
Ok so I decided to go with the 393 stroker and run e85 to help get more torque and hp. Now I have prc cnc'ed 2.5 243 heads and I'm debating about getting it ported is it worth the cost? So can anyone lean me in the right direction to run this setup? I was just going to go with callies/eagle/manle. i really want to ho lunati but an extra $1000 seems a little too steep. Any suggestions? Also will I have to clear the block for this stroke?
Last edited by flipmike22; Mar 1, 2013 at 03:28 PM.
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
So I found a stroked 408 ls2 aluminum. 2400 for everything listed
LS2 block bored out to 4.03
Wiseco 6448RX3 pistons which put the compression for the motor at about 13.8:1 with .040 head gaskets
Wiseco 6125 h beam connecting rods with arp bolts
4340 Balanced crank shaft with the stoke being 4.00
ARP Mainstuds
ls7 windage tray
If anyone has any debate about this please fill me in!!
LS2 block bored out to 4.03
Wiseco 6448RX3 pistons which put the compression for the motor at about 13.8:1 with .040 head gaskets
Wiseco 6125 h beam connecting rods with arp bolts
4340 Balanced crank shaft with the stoke being 4.00
ARP Mainstuds
ls7 windage tray
If anyone has any debate about this please fill me in!!
I know some people bore the LS2 out .030", but in my opinion that's too much on an aluminum block with sleeves. Most reputable machine shops don't like going past .015" overbore. I believe GM says .020" max. Personally, I'd pass.
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
Built by dds performance it's a local shop. Very reputable. He dropped a valve has the new piston and I'm taking the block in tomorrow for inspection. If the block is good I plan on picking it up. Ill throw my prc 2.5 243's(debating about porting it and maybe a valve job to maybe get some crazy air flow for a custom cam?(opinions?) also anyone have some suggestions with the valve springs retainers and all? I have ls7 lifters with I believe ls6 beehive springs. I'm definitely getting the patriot hold duals since I've heard great reviews about them.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
Ok so update I picked up the short block. But now I'm debating about doing a valve job and porting my heads more. Would this be overkill? My heads are prc 2.5 cnc 243's the cc I don't remember. The guy who I got the motor from said he dynoed 750 with the same short block but ported 243 heads, e85 tune and I forgot the test of his valve train.
I searched the forum for the word overkill, couldnt find it. Can you please define? I dont know the pistons but it sounds like they could be domed from the compression so be aware with cam and ccs, there was a guy on here last week Iis the only reason I mention.
IMO there is no overkill when it comes to heads and valvetrain...but im an old school NA guy. Ok maybe double tapered 9/16" salt tempered pushrods are too much, but just barely so.
IMO there is no overkill when it comes to heads and valvetrain...but im an old school NA guy. Ok maybe double tapered 9/16" salt tempered pushrods are too much, but just barely so.
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
I searched the forum for the word overkill, couldnt find it. Can you please define? I dont know the pistons but it sounds like they could be domed from the compression so be aware with cam and ccs, there was a guy on here last week Iis the only reason I mention.
IMO there is no overkill when it comes to heads and valvetrain...but im an old school NA guy. Ok maybe double tapered 9/16" salt tempered pushrods are too much, but just barely so.
IMO there is no overkill when it comes to heads and valvetrain...but im an old school NA guy. Ok maybe double tapered 9/16" salt tempered pushrods are too much, but just barely so.
You haven't listened to my advice yet, but here is my opinion anyway. If you already have low mileage PRC 2.5 CNC 243 heads, I doubt you'll gain much more from extra porting. Certainly not enough to justify the extra cost. If they're high mileage heads, freshen them up with a valve job and maybe a little mill.
Thread Starter
Staging Lane
Joined: Oct 2011
Posts: 55
Likes: 0
Ok so update I picked up the ls2 408 stroker I had mentioned earlier and dropped it off at the shop and rehoned a cylinder and line honed.
Now I've been strongly debating about the l92 heads with this set up.
As far as cam I'm going custom grind cam. With a .650 lift. Lmk opinions and such
70cc chamber
Big stainless valves 2.16 intake and 1.60 exhaust
Dual patriot springs
Now I've been strongly debating about the l92 heads with this set up.
As far as cam I'm going custom grind cam. With a .650 lift. Lmk opinions and such
70cc chamber
Big stainless valves 2.16 intake and 1.60 exhaust
Dual patriot springs